期刊名称：International Journal of Environment and Bioenergy
电子版ISSN：2165-8951
出版年度：2013
卷号：6
期号：1
页码：13-27
语种：English
出版社：Modern Scientific Press
摘要：The present limnological study on Nigeen lake revealed that water of the lake was alkaline in nature and the total hardness was mainly due to bicarbonates of Ca~(2+) and Mg~(2+) . Though the nutrient content of the lake was generally low, yet an increasing trend was noticed around floating gardens especially during summer. In total 30 genera of phytoplankton were identified, in which Chlorophyceae was the dominant class with 12 species, followed by Bacillariophyceae with 9 species, 7 belonged to Cyanophyceae and only 2 to Euglenophyceae. Phytoplankton exhibited its maximum growth and development during summer season near residential areas and floating gardens. A clear dominance of Chlorophyceae over Bacillariophyceae, Cyanophyceae and Euglenophyceae was observed throughout the study period. Shannon-Wiener index of phytoplankton signifies the water body to be moderately diverse as the values lies below 5.00 while as values of Simpson diversity index indicate accelerated eutrophication. However, Bray-Curtis cluster analysis showed the highest similarity between pollution rich sites while dissimilarity was observed between less polluted sites.
